DigiFun PSK31 TRX

The PSK31 transceiver from DL-QRP-AG

Frontside view

Features:

Allband possible by plug in band modules.
High dynamic receiver with diode ringmixer(HPF505) PLUS preselektor.
Rag chew push pull PA (max. output 10Watt).
Power adjustable.
Frequency fine tuning (Window Shift) for growing frequency range.
S-Meter / Power meter connection.
Build in soundcard interface Line-in / Mic-in fully decoupled.
COM-interface for PTT.
All ports decoupled from PC! AF decoupled by special AF transformers, PTT decoupled by optocoupler.
only a few external wirings.

PCB 1: Signal generator, RX-trontendl, T/R mixer, TXl incl. low pass filter, T/R -switching, PC-interface with AF transformers + optocouplers. PTT, voltage regulators

PCB 2: Bandmodul band- Xtal, ;TX/RX bandpassfilters

PCB 3: 9MHz-IF with 9 pole monolitic filter 2.4 kHzl, demodulator, AGC-generator, S-meter- / Pout-amplifier, 9MHz-SSB-exciter (USB only).

Remark: PCB 3 is the same PCB used for the high level 2m SSB/CW transceiver.
Visit DL-QRP-AG homepage for further descriptions!

Backside view

Opened housing

PCB3: IF board

PCB1: Mainboard

PCB2: Bandmodule

Additional parts i used:

Description	Conrad Electronic part no.
1x Amperemeter 1mA	134945-62
1x Switch On/Off 0-1	701661-62
2x Button black	720119-62
2x Covercap for button black	720224-62
2x Pointer for button, red	720321-62
1x Socket 2,1mm (for power supply)	738190-62
1x Socket DIN 5pin (NF/PTT)	738140-62
1x Plug DIN 5pin	737445-62
1x Metal housing 150x200x110mm	520454-62
1x Coolingplate	188000-62

PCB1: PA

My experience building up the kit

The instructions are clear and with soldering experience you will be able to build it up.
But at the end mine didn't worked at all.
I have to add that i didn't spent much time on finding the error yet since i dont have any hf-measurement equipment at home.